Battery and battery pack

Abstract

The utility model discloses a battery and a battery pack, and belongs to the technical field of batteries, and the battery comprises a shell with an accommodating cavity; the cover body is provided with a pole hole, and the pole hole penetrates through the cover body in the first direction; the electrode assembly is arranged in the containing cavity, the electrode assembly comprises a battery cell body and a tab part, the tab part is arranged on the side, facing the cover body, of the battery cell body, and the tab part extends towards the cover body in the first direction; the pole is arranged in the pole hole in a penetrating manner, the pole is electrically connected with the tab part in the first direction, a first groove is formed in the side, away from the tab part, of the pole, the first groove is provided with a bottom wall and a peripheral wall surrounding the bottom wall, and at least part of the tab part is arranged opposite to the bottom wall in the first direction; the supporting piece is arranged in the first groove, the extending direction of the supporting piece intersects with the first direction, and the two ends, in the extending direction of the supporting piece, of the supporting piece are connected with the peripheral wall. According to the invention, the space of the accommodating cavity occupied by the tab part is reduced, and the structural strength of the pole and the connection stability of the pole and the tab part are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery and a battery pack. BACKGROUND

[0002] At present, in the manufacturing process of a power battery with multiple battery cells, the tab of each battery cell is usually stacked and electrically connected with a corresponding pole after being gathered, and then the multiple battery cells need to be combined and attached and then loaded into a battery shell. During the combining process, the tab needs to be bent, and the bending of the tab not only occupies the internal space of the battery shell, but also easily causes tearing at the root of the tab, thereby causing the risk of failure of the electrical connection between the battery cell and the pole and short circuit of the battery cell. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims to solve the above technical problems, and another object of the application is to provide a battery pack using the above battery.

[0004] TECHNICAL SCHEME: The battery provided by the embodiment of the application has a first direction, and comprises:

[0005] a shell having a receiving cavity and an opening communicating with the receiving cavity;

[0006] a cover body covering the opening, the cover body being provided with a pole hole penetrating through the cover body in the first direction;

[0007] an electrode assembly arranged in the receiving cavity, the electrode assembly comprising a battery cell body and a tab portion, the tab portion being arranged on a side of the battery cell body facing the cover body and extending towards the cover body in the first direction;

[0008] a pole arranged in the pole hole, the pole being electrically connected with the tab portion in the first direction, a first groove being formed on a side of the pole away from the tab portion, the first groove having a bottom wall and a peripheral wall surrounding the bottom wall, at least part of the tab portion being arranged opposite to the bottom wall in the first direction;

[0009] a support member arranged in the first groove, the support member extending in a direction intersecting the first direction, and the support member being connected with the peripheral wall at both ends thereof in the extending direction.

[0010] In some embodiments, the support member is connected with the bottom wall, and the support member divides the first groove and forms a plurality of sub-grooves.

[0011] In some embodiments, a plurality of support members are arranged at intervals.

[0012] The support member and the pole are integrally formed.

[0013] In some embodiments, the outer periphery of the pole post has a first mating surface facing the hole wall of the pole post hole, the first mating surface is arranged obliquely relative to the first direction, and the first mating surface and the hole wall of the pole post hole are sealingly connected.

[0014] In some embodiments, the pole post comprises:

[0015] a main body, penetrating the pole post hole, the first groove being arranged on the main body;

[0016] a first limiting portion, arranged on a side of the cover body away from the battery body, the first limiting portion surrounding and connecting the main body;

[0017] a second limiting portion, arranged on a side of the cover body away from the first limiting portion, the second limiting portion surrounding and connecting the main body, and the first limiting portion and the second limiting portion clamping the cover body.

[0018] In some embodiments, the main body has a first end and a second end arranged oppositely in the first direction, the slot of the first groove is located at the first end, and the second end is connected to the tab portion;

[0019] The cross-sectional area of the main body perpendicular to the first direction increases from the first end to the second end.

[0020] In some embodiments, the cover body has a first surface and a second surface arranged oppositely in the first direction, the first surface being away from the battery body;

[0021] The battery further comprises:

[0022] a first insulating member comprising a first insulating portion and a second insulating portion connected to each other, part of the first insulating portion penetrating the pole post hole, the first insulating portion surrounding the main body, and the first insulating portion being connected to the main body and the hole wall of the pole post hole respectively; the second insulating portion being spaced between the first surface and the first limiting portion, and the second insulating portion being connected to the first limiting portion and the cover body respectively;

[0023] a sealing member comprising a first sealing portion and a second sealing portion connected to each other, the first sealing portion surrounding the main body, and the first sealing portion sealingly connecting the main body and the hole wall of the pole post hole, the second sealing portion being arranged between the second surface and the second limiting portion, and the second sealing portion sealingly connecting the second surface and the second limiting portion;

[0024] a second insulating member arranged in the accommodating cavity, the second insulating member being connected to the second surface, and part of the second insulating member being spaced between the second limiting portion and the second surface.

[0025] In some embodiments, the cover has a first surface and a second surface oppositely arranged in the first direction, the first surface faces away from the battery body;

[0026] The battery further comprises:

[0027] The first insulation member comprises a first insulation part, a second insulation part and a fourth insulation part connected together, the first insulation part, the second insulation part and the fourth insulation part respectively surround the pole, the first insulation part is arranged in the pole hole, and the first insulation part is connected to the pole and the hole wall of the pole hole respectively; the second insulation part is arranged on the side of the cover away from the battery body, and the second insulation part is connected to the first surface and the pole respectively; the fourth insulation part is arranged on the side of the cover away from the second insulation part, and the fourth insulation part is connected to the second surface and the pole respectively, and the second insulation part and the fourth insulation part clamp the cover;

[0028] The second insulation member is arranged in the accommodating cavity, the second insulation member is connected to the second surface, and the second insulation member is spaced between the fourth insulation part and the battery body.

[0029] In some embodiments, the first surface is provided with a first protrusion, and the first protrusion surrounds the pole hole;

[0030] The first insulation member further comprises a third insulation part connected to the second insulation part, part of the third insulation part is arranged on the side of the first protrusion away from the pole hole, and the third insulation part and the first insulation part clamp the first protrusion.

[0031] In some embodiments, the cover has a first surface and a second surface oppositely arranged in the first direction, the first surface faces away from the battery body, and the second surface is provided with a second protrusion protruding towards the battery body.

[0032] In some embodiments, the second protrusion and the cover are integrally formed, and the first surface is provided with a second groove corresponding to the second protrusion in the first direction.

[0033] In some embodiments, the battery further comprises:

[0034] The second insulation member is arranged in the accommodating cavity, the second insulation member is connected to the second surface, the second insulation member has a third groove, and the second protrusion is embedded in the third groove.

[0035] Correspondingly, the battery pack provided by the embodiments of the present application comprises the battery described above.

[0036] Beneficial effects: a battery of an embodiment of the application includes a shell, a cover, an electrode assembly, a pole and a support. The shell has a receiving cavity and an opening communicating with the receiving cavity. The cover is arranged on the opening, and the cover is provided with a pole hole penetrating the cover in a first direction. The electrode assembly is arranged in the receiving cavity, and the electrode assembly includes a cell body and a tab part arranged on a side of the cell body facing the cover and extending towards the cover in the first direction. The pole is arranged in the pole hole and electrically connected to the tab part in the first direction. The side of the pole away from the tab part is provided with a first groove having a bottom wall and a peripheral wall surrounding the bottom wall, and at least part of the tab part is arranged opposite the bottom wall in the first direction. The support is arranged in the first groove, the extension direction of the support intersects the first direction, and the support is connected to the peripheral wall at both ends of the extension direction of the support. By arranging the first groove and arranging at least part of the tab part opposite the bottom wall, the tab part can be electrically connected to the pole by penetrating welding of the pole and the tab part, the electrical connection between the cell body and the pole can be achieved without bending the tab part, the problem of tearing caused by bending the tab part is avoided, and the space occupied by the tab part in the receiving cavity for bending is reduced. On this basis, the support is arranged in the first groove, the support is connected to the peripheral wall, the structural strength of the pole is strengthened in the case of reducing the wall thickness of the pole in the first groove, the first groove provides a space for penetrating welding of the pole and the tab part, and the connection stability of the pole is improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0038] Figure 1 is a structural schematic diagram of a battery of an embodiment of the application;

[0039] Figure 2 is an exploded structural schematic diagram of a battery of an embodiment of the application;

[0040] Figure 3 is an exploded structural schematic diagram of a cover, a pole, a first insulating part, a second insulating part and a sealing part of an embodiment of the application;

[0041] Figure 4 is a structural schematic diagram of a front view of a first surface of a cover of an embodiment of the application;

[0042] Figure 5 is Figure 4 is a sectional structural schematic diagram along line A-A in

[0043] Figure 6 is Figure 4A cross-sectional structure schematic view along the line B-B of the middle part;

[0044] Figure 7 A structure schematic view of a front view of the cover of another embodiment of the application;

[0045] Figure 8 A structure schematic view of a front view of the cover of another embodiment of the application; Figure 7 A cross-sectional structure schematic view along the line C-C of the middle part;

[0046] Figure 9 A structure schematic view of a front view of the cover of another embodiment of the application; Figure 7 A cross-sectional structure schematic view along the line D-D of the middle part;

[0047] Figure 10 A structure schematic view of a front view of the cover of another embodiment of the application;

[0048] Figure 11 A structure schematic view of a front view of the cover of another embodiment of the application;

[0049] Figure 12 A structure schematic view of a front view of the cover and the second insulation member of another embodiment of the application;

[0050] Figure 13 A structure schematic view of a front view of the cover and the second insulation member of another embodiment of the application; Figure 12 A cross-sectional structure schematic view along the line E-E of the middle part;

[0051] Reference signs: 1, housing; 10, accommodating cavity; 11, opening; 2, cover; 20, pole post hole; 200, second matching surface; 21, first surface; 22, second surface; 23, first protruding part; 24, second limiting groove; 25, pressure relief hole; 26, liquid injection hole; 27, second protruding part; 270, second groove; 3, electrode assembly; 30, battery cell body; 31, tab part; 4, pole post; 40, first groove; 400, bottom wall; 401, peripheral wall; 402, sub-groove; 41, support member; 42, first matching surface; 43, main body; 430, first limiting groove; 44, first limiting part; 45, second limiting part; 46, first end; 47, second end; 5, first insulation member; 50, first insulation part; 51, second insulation part; 52, third insulation part; 53, fourth insulation part; 6, sealing member; 60, first sealing part; 61, second sealing part; 7, second insulation member; 70, third groove; 8, pressure relief valve; 9, sealing plug; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0052] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0053] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise explicitly specified.

[0054] At present, in the manufacturing process of the multi-cell power battery, the tab of the cell is usually stacked and electrically connected with the corresponding pole after being gathered, and then the multiple cells need to be combined and attached for re-assembly into the battery shell. During the combining process, the tab needs to be bent, and the bending of the tab not only occupies the internal space of the battery shell, but also easily causes tearing at the root of the tab, which has the risk of failure of electrical connection between the cell and the pole and short circuit of the cell.

[0055] Therefore, with reference to Figures 1 to 13 , the present application provides a battery to solve at least one of the above technical problems.

[0056] With reference to Figures 1 to 13 , a battery includes a shell 1, a cover 2, an electrode assembly 3, a pole 4, and a support 41.

[0057] It should be noted that the first direction X, the second direction Y and the third direction Z are introduced in each of the following embodiments of the present application, which are intersected with each other. Among them, the first direction X is substantially parallel to the thickness direction of the cover 2, the second direction Y is substantially parallel to the length direction of the cover 2, and the third direction Z is substantially parallel to the width direction of the cover 2.

[0058] The shell 1 has a receiving cavity 10 and an opening 11 communicating with the receiving cavity 10, and the cover 2 is arranged on the opening 11. The cover 2 is provided with a pole hole 20 penetrating the cover 2 in the first direction X. The electrode assembly 3 is arranged in the receiving cavity 10, and the electrode assembly 3 includes an electrode core body 30 and a tab portion 31 arranged on a side of the electrode core body 30 facing the cover 2 and extending towards the cover 2 along the first direction X. The pole 4 is arranged in the pole hole 20, and the pole 4 is electrically connected to the tab portion 31 in the first direction X. The pole 4 is provided with a first groove 40 on a side away from the tab portion 31, and the first groove 40 has a bottom wall 400 and a peripheral wall 401 surrounding the bottom wall 400. At least part of the tab portion 31 is arranged opposite to the bottom wall 400 in the first direction X. The support 41 is arranged in the first groove 40, and the extension direction of the support 41 intersects the first direction X. The support 41 is connected to the peripheral wall 401 at both ends in the extension direction of the support 41.

[0059] By arranging the first groove 40 and arranging at least part of the tab portion 31 opposite to the bottom wall 400, the tab portion 31 can be electrically connected to the pole 4 by penetrating welding of the pole 4 and the tab portion 31, without bending the tab portion 31 to achieve electrical connection between the electrode core body 30 and the pole 4. Compared with bending the tab portion 31, the use of materials is reduced, the problem of tearing of the tab portion 31 caused by bending the tab portion 31 is avoided, and the space occupied by the tab portion 31 in the receiving cavity 10 is reduced, thereby facilitating improvement of space utilization in the receiving cavity 10.

[0060] On this basis, the support 41 is arranged in the first groove 40, and the support 41 is connected to the peripheral wall 401, thereby strengthening the structural strength of the pole 4, while retaining the first groove 40 to provide space for penetrating welding of the pole 4 and the tab portion 31 and improve the connection stability of the pole 4.

[0061] Specifically, in some embodiments, referring to Figures 3 to 9 , the support 41 is connected to the bottom wall 400, and the support 41 divides the first groove 40 into a plurality of sub-grooves 402. The support 41 extends along the third direction Z and is connected to opposite sides of the peripheral wall 401 and the bottom wall 400, respectively, so as to divide the first groove 40 into a plurality of sub-grooves 402 distributed in the second direction Y. The support 41 is simultaneously connected to the bottom wall 400 and the peripheral wall 401, thereby facilitating further improvement of the structural strength of the pole 4.

[0062] In some embodiments, referring to Figures 3 to 9The support 41 is provided in plurality, and the plurality of supports 41 are arranged at intervals. Compared with the support 41 being provided in one, the structural strength of the pole 4 gradually increases with the increase of the number of the support 41. It can be understood that the number of the support 41 can be flexibly increased or decreased under the condition that the size of the opening 11 of the sub-groove 402 can allow the penetration welding equipment to smoothly extend into, and details are not repeated here.

[0063] In some embodiments, referring to Figures 3 to 9 The support 41 and the pole 4 are integrally formed. On the one hand, the integrally formed support 41 and pole 4 facilitate rapid processing and manufacturing, improving the efficiency of processing and manufacturing, and on the other hand, the support 41 can assist in improving the flow capacity of the pole 4 on the basis of providing structural strength.

[0064] In some embodiments, referring to Figures 3 to 9 The outer periphery of the pole 4 has a first matching surface 42 facing the hole wall of the pole hole 20, the first matching surface 42 is arranged at an angle relative to the first direction X, and the first matching surface 42 is sealingly connected with the hole wall of the pole hole 20. In this embodiment, the hole wall of the pole hole 20 is also provided with a second matching surface 200 matching the inclination angle of the first matching surface 42. The use of the inclined sealing first matching surface 42 and the second matching surface 200 is beneficial to further shorten the length of the pole 4 in the first direction X, thereby reducing the space occupation of the pole 4.

[0065] In some embodiments, referring to Figures 3 to 6 The pole 4 includes a main body 43, a first limiting portion 44, and a second limiting portion 45. The main body 43 is arranged in the pole hole 20, and the first recess 40 is arranged in the main body 43. The first limiting portion 44 is arranged on the side of the cover 2 away from the cell body 30, and the first limiting portion 44 surrounds and connects the main body 43. The second limiting portion 45 is arranged on the side of the cover 2 away from the first limiting portion 44, and the second limiting portion 45 surrounds and connects the main body 43, and the first limiting portion 44 and the second limiting portion 45 clamp the cover 2. The first limiting portion 44 can be separately arranged with the main body 43, and the main body 43 and the second limiting portion 45 can be integrally formed or separately welded. The first limiting portion 44 is arranged in the first limiting groove 430 of the main body 43, and the first limiting portion 44 and the main body 43 are welded to replace the riveting process to fix the pole 4, which is beneficial to simplify the processing technology of the pole 4.

[0066] In some embodiments, referring to Figures 3 to 6 The main body 43 has a first end 46 and a second end 47 arranged at opposite positions in the first direction X, and the slot opening of the first recess 40 is located at the first end 46, and the second end 47 is connected with the tab portion 31. The cross-sectional area of the main body 43 perpendicular to the first direction X increases from the first end 46 to the second end 47. In this embodiment, the cross-sectional area of the main body 43 perpendicular to the first direction X increases from the first end 46 to the second end 47.

[0067] In some embodiments, referring to Figures 3 to 6 In the first direction X, the dimension between the bottom wall 400 and the second end 47 is a, which satisfies 0.5mm≤a≤2mm.

[0068] Specifically, a can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm or a range value formed by any two of them. Setting the thickness between the bottom wall 400 and the second end 47 to be between 0.5mm and 2mm ensures that the subsequent pole column 4 and tab part 31 can smoothly penetrate welding and the overall structural strength of the pole column 4.

[0069] In some embodiments, referring to Figures 3 to 6 The cover 2 has a first face 21 and a second face 22 arranged oppositely in the first direction X, and the first face 21 faces away from the cell body 30. The battery further comprises a first insulating member 5, a sealing member 6 and a second insulating member 7.

[0070] The first insulating member 5 comprises a first insulating part 50 and a second insulating part 51 connected to each other, part of the first insulating part 50 is arranged in the pole column hole 20, the first insulating part 50 surrounds the main body 43, and the first insulating part 50 is connected to the main body 43 and the hole wall of the pole column hole 20 respectively. The second insulating part 51 is arranged between the first face 21 and the first limiting part 44, and the second insulating part 51 is connected to the first limiting part 44 and the cover 2 respectively. The sealing member 6 comprises a first sealing part 60 and a second sealing part 61 connected to each other, the first sealing part 60 surrounds the main body 43, the first sealing part 60 sealingly connects the main body 43 and the hole wall of the pole column hole 20, and the second sealing part 61 is arranged between the second face 22 and the second limiting part 45, and the second sealing part 61 sealingly connects the second face 22 and the second limiting part 45. The second insulating member 7 is arranged in the accommodating cavity 10, the second insulating member 7 is connected to the second face 22, and part of the second insulating member 7 is arranged between the second limiting part 45 and the second face 22.

[0071] In addition, referring to Figures 3 to 6 The first face 21 is provided with a first protruding part 23 surrounding the pole column hole 20. The first insulating member 5 further comprises a third insulating part 52 connected to the second insulating part 51, part of the third insulating part 52 is arranged on the side of the first protruding part 23 away from the pole column hole 20, and the third insulating part 52 and the first insulating part 50 clamp the first protruding part 23.

[0072] The first insulation part 50, the second insulation part 51 and the third insulation part 52 can be integrally formed by injection molding, and the first insulation member 5 is insulated and spaced between the pole 4 and the cover 2 to ensure the insulation effect between the pole 4 and the cover 2. The second insulation member 7 is insulated and spaced between the electrode assembly 3 and the cover 2 to ensure the insulation effect between the electrode assembly 3 and the cover 2. By additionally arranging the sealing member 6 between the pole 4 and the cover 2, and after welding the first limiting part 44, the sealing member 6 is in a compressed state, thereby improving the sealing effect at the pole hole 20. The first protrusion 23 is used for clamping the third insulation part 52 and the first insulation part 50, which is conducive to further improving the structural stability of the first insulation member 5 and the pole 4.

[0073] In addition, with reference to Figure 6 、 Figure 11 and Figure 12 , the second face 22 further has a second groove 270 surrounding the pole hole 20, and the second groove 270 is communicated with the pole hole 20. The second sealing part 61 and part of the second insulation member 7 are embedded in the second groove 270 and are respectively spaced between the second limiting part 45 and the cover 2, and the second groove 270 improves the stability of the second insulation member 7 and is conducive to shortening the size of the pole 4 in the first direction X.

[0074] In some embodiments, with reference to Figures 7 to 9 , which is different from that shown in Figures 3 to 6 , the sealing member 6 is cancelled, that is, the battery further includes the first insulation member 5 and the second insulation member 7. The pole 4 is similar to the above-mentioned main body 43 as a whole, and the first insulation member 5 includes the first insulation part 50, the second insulation part 51 and the fourth insulation part 53 connected with each other. The first insulation part 50, the second insulation part 51 and the fourth insulation part 53 respectively surround the pole 4, the first insulation part 50 is arranged in the pole hole 20, and the first insulation part 50 is connected with the pole 4 and the hole wall of the pole hole 20 respectively. The second insulation part 51 is arranged on the side of the cover 2 away from the battery body 30, and the second insulation part 51 is connected with the first face 21 and the pole 4 respectively. The fourth insulation part 53 is arranged on the side of the cover 2 away from the second insulation part 51, and the fourth insulation part 53 is connected with the second face 22 and the pole 4 respectively, and the second insulation part 51 and the fourth insulation part 53 clamp the cover 2. The second insulation member 7 is arranged in the accommodating cavity 10, the second insulation member 7 is connected with the second face 22, and the second insulation member 7 is spaced between the fourth insulation part 53 and the battery body 30.

[0075] The first insulation part 50, the second insulation part 51 and the fourth insulation part 53 can be integrally formed by injection molding, that is, a plastic seal is arranged between the pole 4 and the pole hole 20, which simplifies the structure and is conducive to shortening the size of the pole 4 in the first direction X and improving the space utilization rate of the accommodating cavity 10.

[0076] In addition, with reference to Figure 8 、 Figure 9 ,Figure 11 and Figure 12 The second surface 22 further has a second groove 270 surrounding the pole hole 20, and the second groove 270 is communicated with the pole hole 20. The fourth insulation part 53 is embedded in the second groove 270, and the second insulation part 7 is located on the side of the fourth insulation part 53 away from the cover 2. The second groove 270 is beneficial to improve the stability of the first insulation part 5 and shorten the size of the pole 4 in the first direction X.

[0077] In some embodiments, referring to Figures 10 to 12 The second surface 22 protrudes towards the battery body 30 and has a second protrusion 27. The shape and size of the second protrusion 27 are not unique. In the embodiment, the cross section of the second protrusion 27 perpendicular to the first direction X is square or rectangular. In other embodiments, other polygonal or special-shaped structures can be used to strengthen the overall structure of the cover 2 and reduce the deformation of the cover 2 under stress.

[0078] In some embodiments, referring to Figures 10 to 12 The second protrusion 27 and the cover 2 are integrally formed, and the first surface 21 has a second groove 270 corresponding to the second protrusion 27 in the first direction X. The second protrusion 27 can be formed by stamping the cover 2 integrally, and the second groove 270 is formed. Compared with the solid protrusion structure, the second groove 270 is beneficial to reduce the weight of the cover 2 and thus reduce the increase of the total weight of the battery.

[0079] In some embodiments, referring to Figure 12 The second insulation part 7 has a third groove 70, and the second protrusion 27 is embedded in the third groove 70. It can be understood that the third groove 70 is formed in the second insulation part 7 for embedding the second protrusion 27, which can improve the stability of the second insulation part 7 and the cover 2, and also assist in enhancing the structural strength of the second protrusion 27.

[0080] In addition, it should be noted that, referring to Figures 1 to 3 The cover 2 has a pressure relief hole 25 and a liquid injection hole 26 distributed in the middle part in the second direction Y. Correspondingly, the pressure relief hole 25 is provided with a pressure relief valve 8, and the liquid injection hole 26 is provided with a sealing plug 9. The structure of the pressure relief valve 8 and the liquid injection hole 26 is a prior art, which will not be described here.

[0081] Correspondingly, the application provides a battery pack, which comprises the above-mentioned battery. The battery pack can be applied to electronic devices, power storage devices, and power cars. It can be understood that the battery pack can have all the technical features and corresponding advantages of the above-mentioned battery, which will not be described here.

[0082] The above has carried out the detailed introduction to the battery and the battery pack provided by the embodiment of the application, and the principle and implementation mode of the application are described by applying specific examples; the above embodiment description is only used for helping understanding the technical solutions and core ideas of the application; the person skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A battery, characterized by, The battery has a first direction, and comprises: a housing having a receiving cavity and an opening communicating with the receiving cavity; a cover body covering the opening, the cover body being provided with a pole post hole penetrating through the cover body in the first direction; an electrode assembly arranged in the receiving cavity, the electrode assembly comprising an electrode core body and a tab portion arranged on a side of the electrode core body facing the cover body and extending towards the cover body in the first direction; a pole post arranged in the pole post hole and electrically connected to the tab portion in the first direction, the pole post being provided with a first groove on a side away from the tab portion, the first groove having a bottom wall and a peripheral wall surrounding the bottom wall, and at least part of the tab portion being arranged opposite the bottom wall in the first direction; a support member arranged in the first groove, the support member extending in a direction intersecting the first direction and being connected to the peripheral wall.

2. The battery of claim 1, wherein: the support member is connected to the bottom wall, and the support member divides the first groove to form a plurality of sub-grooves.

3. The battery of claim 1 or 2, wherein: a plurality of support members are arranged spaced apart from each other; and / or the support member and the pole post are integrally formed.

4. The battery of claim 1, wherein: an outer periphery of the pole post has a first mating surface facing a hole wall of the pole post hole, the first mating surface being arranged obliquely relative to the first direction, and the first mating surface is sealingly connected to the hole wall of the pole post hole.

5. The battery of claim 4, wherein, the pole post comprises: a main body arranged in the pole post hole, the first groove being arranged on the main body; a first limiting portion arranged on a side of the cover body away from the electrode core body, the first limiting portion surrounding and connected to the main body; a second limiting portion arranged on a side of the cover body away from the first limiting portion, the second limiting portion surrounding and connected to the main body, and the first limiting portion and the second limiting portion clamping the cover body.

6. The battery of claim 5, wherein: the main body has a first end and a second end arranged opposite in the first direction, an opening of the first groove being located at the first end, and the second end being connected to the tab portion; a cross-sectional area of the main body perpendicular to the first direction increases from the first end to the second end.

7. The battery of claim 5, wherein: the cover body has a first surface and a second surface arranged opposite in the first direction, the first surface being away from the electrode core body; the battery further comprises: a first insulating member comprising a first insulating portion and a second insulating portion connected to each other, part of the first insulating portion being arranged in the pole post hole, the first insulating portion surrounding the main body, and the first insulating portion being connected to the main body and the hole wall of the pole post hole respectively; and the second insulating portion being arranged spaced apart between the first surface and the first limiting portion, and the second insulating portion being connected to the first limiting portion and the cover body respectively. The sealing member comprises a first sealing part and a second sealing part connected with each other, the first sealing part surrounds the main body and seals the hole wall connecting the main body and the pole hole, and the second sealing part is arranged between the second surface and the second limiting part and seals the second surface and the second limiting part. The second insulating member is arranged in the accommodating cavity, the second insulating member is connected with the second surface, and a part of the second insulating member is spaced between the second limiting part and the second surface.

8. The battery of claim 4, wherein the cover has a first surface and a second surface arranged oppositely in the first direction, the first surface faces away from the battery body; the battery further comprises: a first insulating member comprising a first insulating part, a second insulating part and a fourth insulating part connected with each other, the first insulating part, the second insulating part and the fourth insulating part surround the pole respectively, the first insulating part is arranged in the pole hole, and the first insulating part is connected with the pole and the hole wall of the pole hole respectively; the second insulating part is arranged on the side of the cover away from the battery body, and the second insulating part is connected with the first surface and the pole respectively; the fourth insulating part is arranged on the side of the cover away from the second insulating part, and the fourth insulating part is connected with the second surface and the pole respectively, and the second insulating part and the fourth insulating part clamp the cover; a second insulating member arranged in the accommodating cavity, the second insulating member is connected with the second surface, and the second insulating member is spaced between the fourth insulating part and the battery body.

9. The battery of claim 7 or 8, wherein the first surface is provided with a first protruding part, and the first protruding part surrounds the pole hole; the first insulating member further comprises a third insulating part connected with the second insulating part, a part of the third insulating part is arranged on the side of the first protruding part away from the pole hole, and the third insulating part and the first insulating part clamp the first protruding part.

10. The battery of claim 1, wherein the cover has a first surface and a second surface arranged oppositely in the first direction, the first surface faces away from the battery body, and the second surface is provided with a second protruding part protruding towards the battery body.

11. The battery of claim 10, wherein the second protruding part and the cover are integrally formed, and the first surface is formed with a second groove corresponding to the second protruding part in the first direction.

12. The battery according to claim 10 or 11, characterized in that, the battery further comprises: a second insulating member arranged in the accommodating cavity, the second insulating member is connected with the second surface, the second insulating member has a third groove, and the second protruding part is embedded in the third groove.

13. A battery pack, characterized by a battery as claimed in any one of claims 1 to 12.

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